Sanitary-can end and process of preparing same



J. E. SCHENCK.

SANITARY CAN END AND PROCESS OF PREPARING SAME.

APPLICATION FILED mu: 8. 1918.

1 ,373,025, Patented Mar. 29, 1.921.

UNITED STATES PATENT OFFICE.

JOHN ELSWORTH SCHENCK, OF NEW YORK, N. Y., ASSIGNOR .TO AMERICAN CAN COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY,

SANITARY-CAN END AND PROCESS OF PREPARING SAME.

Application filed June 8, 1918.

T 0 all whom it may concern:

Be it known that I, JOHN E. SoHENoK, a citizen of the United States, residing in New York, in the county of New York and State of New York, have invented a new and useful Improvement in Sanitary-Can Ends and Processes of Preparing Same, of which the following is a specification.

This 'nvention relates in general to hermetically sealed containers or cans and more particularly to the gasket-lined sanitary can, in which a paper or fibrous gasket liner is applied to the flange of a flanged can end, to be interfolded with the flange of a flanged can body to form a permanent hermetic joint or seam. This character of can is used largely in the packaging of food products, vegetables, fruit and the like, which have a liquid or syrupy content. \Vhere cans of this character are filled and closed by automatic machinery the liquid sometimes comes in contact with the paper of the gasket after the end is applied and before final closure of the seam, occasionally causing it to swell and endangering the certain subsequent formation of a hermetic double seam 1n the interfolding of the flanges of the end and body with the gasket between them. If too much moisture is absorbed by the gasket before the double seam is fully and tightly formed Water-pockets may occur in the seam through the collection of small quantities of moisture retained in the seam, which in time evaporate, leaving a. porous spot and resulting in a leak. Sometimes also this moisture produces a drop in the seam, which, bein incompressible, interferes with the per ect forming of the double seam.

This invention has for its object the prevention of absorption by the gasket of some i of the liquid of the content of the can, and

this without detracting from the fibrous nature of the gasket or its sealing qualities in the seam. The invention contemplates the provision of a new method or process of closing cans of this character, a new method or process of preparing a can end for the forming of a closure, and the provision of an improved gasket and an improved lined can end.

Numerous other objects and-advantages of the invention will be apparent as it is better understood from the following de- Scription when considered in connection Specification of Letters Patent.

Patented Mar. 29, 1921. Serial No. 239,069.

with the accompanying drawing illustrating a preferred embodiment thereof. eferring to the drawing:

F lgure 1 1s a diagrammatic sectional view of an apparatus adapted for the practice of my present invention;

Fig. 2 is a diagrammatic view showing thelcutting of the liner from a sheet of materia Fig. 3 is a similar view showing the application of the liner to the can end;

gig. 4 is a section taken from a can end; an

Fig. 5 is a similar view showing the can end seamed in place.

For the purpose of illustrating my iuvention, I have shown on the drawing an apparatus comprisin a roll 6 of paper or other suitable sheet of fi rous material 7, which is first fed between a pair of rolls 89, the lowermost one of which enters into a bath of lacquer or rubber composition or other moisture proofing material 10 contained within a tank 11. This roll in its movement carries the proofing material up and over in a counter-clockwise direction, a scraper 12 being provided to remove excess material. The roll 8 presses and holds the material to the roll 9 and insures that a proper amount of proofing be received by the under face of the sheet. From the roll the sheet passes through a drying or baking oven 13 for hardening or setting the lacquer or other compound. The paper is preferably run through this apparatus twice, in order that it may be coated on both sides, or of course an apparatus coating both sides simultaneously may be employed. Coating material may be also fed to and applied by the roll 8. After the sheet is coated on one or both sides, as may be required, gasket liners 14 are cut from it by an internal core-removing punch 15 cooperating with the die 16 and an external gasket-cutting punch 17 cooperating with the die 18. The ring gaskets or liners thus provided are placed upon the flanges 19 of can ends 21, said coating being on the exposed face of the gasket which is to come into contact with the double seaming portion of the can body, the edges 22 of said flanges 105 being preferably curled over, as shown in Fig. 4. This assembling is shown diagrammatically as being accomplished by a gasket seating punch or plunger 23 cooperating with a support 24. The lined can end thus 110 produced is ready for assembling with the can and the flange 19 is interfolded in the usual manner With the flange 24 of the can body 25 to form a permanent hermetic seal, the proofing material rendering the gasket impervious to moisture and preventing accumulation of moisture or swelling'of the gasket prior to the formation of the finished double seam made by interfolding the flanges, as already described.

It is thought that the invention and many of its attendant advantages Will be better understood from the foregoing description and it will be apparent that various changes may be made in the form, construction and arrangement of the parts without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the form hereinbefore described being merely a preferred embodiment thereof.

I claim:

1. The herein described process which consists in applying a coating of liquid proofing material to the surface of a thin fibrous sheet, said material being of a rubber-like constitution so as to permit the fold ing and seaming of the gasket Without cracking the same, and then cutting gasket liners from said fibrous sheet.

2. The herein described process which consists in applying a coating of liquid proofing material to the surface of a thin fibrous sheet, said material being of a rubberlike constitution so as to permit the folding and seaming of the gasket without cracking the same, and then cutting gasket liners from said fibrous sheet and assembling them with flan ed can ends.

3. The erein described process which consists in applying a coating of liquid proofing 40 material to the surface of a thin fibrous sheet, said material being of a rubber-like constitution so as to permit the folding and seaming of the gasket without cracking the same, and then cutting gasket liners from said fibrous sheet and assembling them with flanged can ends, and double seaming together said can ends with flanged can bodies.

4. A can end comprising a body sheet of metal, and a fibrous ring liner thereon said ring liner being treated on its outer face with a coating of liquid-proofing material of a rubber-like constitution which permits the folding and seaming of the gasket within a double seam Without cracking of the same.

5. A can end comprising a metal body sheet, and a fibrous ring liner thereon said ring liner being treated on both sides with.

a protective coating of liquid-proofing material of a rubber-like constitution so as to permit the folding of the ring liner within a double seam without cracking the same.

6. A can end comprising a metal sheet having an offset flange provided with an annular shoulder between the flange and body portion of the sheet, and a fibrous ring liner fitting over said flange, said ring liner being treated on itsouter and exposed face with a liquid-proofing material of a rubberlike constitution, so as to permit the folding and" seaming of the ring liner Without cracking the same.

Signed in the presence of two subscribing witnesses.

JOHN ELSWORTH SOHENCK. Witnesses:

JNo. F. FoREMAN, J. V. D. Fos'run. 

